Elongation testing machine



March 10, 1936- o. F. FREELAND ELONGATION TESTING MACHINE Original FiledAug. 10, 1934 5 sh ts-sheet 1 INVENTOR.

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ATTORNEYS March 10, 1936. o. F FREELAND ELONGATION TESTING MACHINEOriginal Filed Aug. 10, 1934 5 Sheets-Sheet 2 INVENTOR.

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ATTORNEYS March 10, 1936. o. F. FREELAND ELONGATION TESTING MACHINEOriginal Filed Aug. 10, 1934 5 Sheets-Sheet 3 INVENTOR.

w M E M f E -v M W m ATTORNEYS Patented Mar. 10, 1936 UNITED STATESPATENT OFFICE] Anaconda Wire & Cable Company, New N. Y., a corporationof Delaware York,

Original application August 10, 1934, Serial No. 739,212. Divided andthis application June 8.

1935, Serial No. 25,535

2 Claims. (o1. 265-12) The present application is a division of myapplication Serial No. 739,212, filed August 10,

This invention relates to improvements in an elongating testing machineand is directed particularly to a machine having clamping meansengageable with the ends of the piece to be tested and the power drivefor automatically moving the clamping means relatively to one another inreverse directions.

The above and various other more detailed features of the invention willbe fully apparent from the following specification when read inconnection with the accompanying drawings, in which- Fig. 1 is a planview illustrating one embodiment of the invention; Fig. '2 is alongitudinal section on line 22 of Fig.- 1; Fig. 3 is an en largedviewin longitudinal section showing the reversible means for operatingone of the clamp holding members; Fig. 4 is a similar view showing thesame parts in reverse position; Fig. 5 is a detail plan view of part ofthe gearing shown in Fig. 3; Fig. 6 is a fragmentary inverted plan ofthe gear rack of Figs. 3 and 4.

Referring in detail to the drawings, ill represents a motor which isadapted by means of pulleys l2 and I4 and belt IE to transmit motion toa counter shaft I8 and through gearing, indicated generally at 20 todrive pinions 22 and 23, which are arranged to alternatively mesh with arack 24 hingedly mounted on a. member 26. These pinions 22 and 23 arecarried on a. lever 25 which is mounted with freedom for a slightoscillating movement from the position of Fig. 3 to the position of Fig.4 and vice versa, the lever being pivoted on the shaft 2|, which carriesthe pinion 22. Pressure on the manually operable control arm 21 willcause the pinion 23 'to' engage the teeth of the rack 24 and the drivingforce, which is transmitted through the pinion 22 tends to keep thepinion 23 engaged with the teeth of the rack until the rack is moved asuflicient distance to bring the interrupted portion 29 thereof intoregister with pinion 23. At this time, the same force assisted bygravity will cause the pinion 23 to drop due to the lack of resistanceby the rack and. when the pinion 23 drops to the position of Fig, 3 itwill automatically rock the lever 25 to a point where the pinion 23 willclear the teeth of the rack and the latter will move about its hingesupport to the position of Fig. 3 into mesh with the pinion 22. Inasmuchas the pinions 22 and 23 revolve in reverse directions, as indicated bythe arrows, the reverse movement will be imparted to the rack. Thus,after each test, the mechanism shown and described is eifective to :etvmthe parts to starting position for the next At its left extremity, therack carries a downwardly depending member formed with a cam surface 3!,which functions to lift the rack from the position of Fig. 3 to theposition of Fig. 4 when the limit of the right hand movement is reached,this cam surface coacting with any suitable part of the framework.

The rack 24 is adapted to reciprocate a test piece engaging member 26which carries suitable clamp jaws 23 adapted to be actuated by a lever30 in a manner hereinafter described, so as to clamp one end of the wireor other test piece 32. The member 26 is slidably supported on guiderods 34 secured to the frame members 36 and 38. A normally fixed testpiece engaging member 40 is provided with clamp jaws 42, which areactuated by lever 44. The movable test piece engaging member 26 haspivotally supported thereon a stylus supporting element 46 and, asshown, its pivotal support includes a stud 48. A pen, pencil, or othersuitable marking member, or stylus, as indicated at 50, is secured tothe end of the element 46 and a spring 52 is provided which normallytends to press the stylus laterally against the work piece under test.As thus arranged, it is clear that when the work piece being tested isfractured. a transverse mark will be made by the stylus.

Suitable means, such as disclosed in my parent application, are providedfor supporting a record sheet for position in coaction with the stylus.

These means are not claimed in the present divisional application and,therefore, will not be ,further described in detail. Suflice it to saythat the record sheet is detachably held in position to receive a graphtranscribed by the stylus, the sheet being ruled with suitable scaledivisions. And when the limit of elongationof the piece under test isreached and the wire breaks the stylus will be deflected under theinfluence of a spring 52 and the graph delineated on the record sheetwill give a reading of the percentage of elongation of the particularwire under test. From the foregoing, it is apparent that after each testthe mechanism shown and described provides power means for automaticallymoving the parts to starting position. It is also apparent that themachine described includes spaced members carrying means for securing atest piece, a power drive an element secured to one of said members andautomatic reversing means operatively connected with said power drivefor moving said element in reverse directions.

The speci'nc reversing means claimed herein,

it will be apparent, involves the employment of a rack for propellingthe means which clamp the test piece, this rack being hingedly mountedand coacting with a pair of meshing pinions driven by the power drive,there being provided a movable mounting adapted to alternately engageone of the pinions with the rack.

While I have described quite precisely the specific embodiment of theinvention illustrated, it is to be understood that various modificationsand substitutions of equivalents may be made by those skilled in the artwithout departure from the invention as set forth in the appendedclaims.

What I claim is:

1. An elongation testing machine of the character described comprisingspaced members carrying clamping means engageable with the opposite endsof the test piece, a power drive, a rack hingedly mounted on one 01'said members and having an interrupted portion, a pair of meshingpinions driven by the power drive, and adapted to be alternately engagedwith said rack and a mounting for one 01' said pinions movable about theaxis of the other pinion.

2. An elongation testing machine of the character described comprisingspaced members carrying clamping means engageable with the opposite endsof the test piece, a power drive, a rack hingedly mounted on one of saidmembers, a pair of meshing pinions driven by the power drive, a mountingfor tilting one 0! said pinions into and out 01 engagement with saidrack, said mounting being pivoted axially oi the other pinion, and saidrack having an interrupted portion adapted to clear the teeth of thetilting pinion and also having a cam surface effective to rock it aboutits pivotal support.

ORV'ILLE F. FREELAND.

